EP0130208B1 - Interrupteur a fermeture et ouverture commandees et a ouverture automatique en cas de surcharge de courant - Google Patents

Interrupteur a fermeture et ouverture commandees et a ouverture automatique en cas de surcharge de courant Download PDF

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Publication number
EP0130208B1
EP0130208B1 EP84900390A EP84900390A EP0130208B1 EP 0130208 B1 EP0130208 B1 EP 0130208B1 EP 84900390 A EP84900390 A EP 84900390A EP 84900390 A EP84900390 A EP 84900390A EP 0130208 B1 EP0130208 B1 EP 0130208B1
Authority
EP
European Patent Office
Prior art keywords
rocker
arm
contacts
contact
pivot
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP84900390A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0130208A1 (fr
Inventor
Elie 7 Chemin Des Concessions Belbel
Christian Blanchard
André Haury
Michel Lauraire
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telemecanique SA
Original Assignee
La Telemecanique Electrique SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by La Telemecanique Electrique SA filed Critical La Telemecanique Electrique SA
Publication of EP0130208A1 publication Critical patent/EP0130208A1/fr
Application granted granted Critical
Publication of EP0130208B1 publication Critical patent/EP0130208B1/fr
Expired legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H77/00—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting
    • H01H77/02—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism
    • H01H77/10—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening
    • H01H77/101—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening with increasing of contact pressure by electrodynamic forces before opening

Definitions

  • the present invention relates to a closing and opening switch controlled by a control member such as an electromagnet and automatic opening in the event of a current overload passing through this switch.
  • switches such as contactors, the movable contact of which is directly connected to the armature of an electromagnet which controls the movement of this movable contact against the action of return means, between a closed position and a contact opening position.
  • Some of these known contactors further comprise means for controlling the automatic opening of the contacts, independently of the action of the electromagnet, when the intensity of the current flowing through the contactor exceeds a predetermined threshold.
  • These means may consist of a magnetic piece concentrating the field in a current loop to increase the intensity of the repulsive forces exerted on the movable contact. This ensures automatic opening of the contacts when the intensity exceeds a predetermined value which is generally of the order of thirty to forty times the nominal intensity.
  • the apparatus described in this patent application comprises several switches with a rigid contact bridge cooperating with fixed contacts carried respectively by conductors communicating repulsion forces to the contact bridge. Otherwise; the central region of the bridge cooperates with a magnetic structure providing the bridge with compensation forces for the contact pressure below a certain threshold: beyond this threshold the bridge is very quickly separated from the fixed contacts.
  • this known device only uses this magnetic structure to produce an additional contact pressure force which is directly opposite to the electro-dynamic repulsion forces.
  • the object of the present invention is to remedy the drawbacks of known embodiments, by creating a switch with controlled closing and opening and with automatic opening having a high breaking capacity (of the order of 100 KA presumed effective) with a guarantee of non -welding of the contacts, and in which the magnetic structure participates in the generation of forces directed in the direction of the opening of the movable contact as soon as the increase in the contact pressure is no longer necessary.
  • the switch targeted by the invention with opening and closing controlled by a control member such as an electromagnet and with automatic opening in the event of a current overload passing through this switch comprises a fixed contact, and a movable contact subjected to the action of a magnetic part which makes it possible to reinforce the contact pressure of the movable contact on the fixed contact below a certain current threshold as well as a mechanical threshold device which is triggered by ensuring the opening of the contacts when the magnetic part exerts on the moving contact a force which exceeds that corresponding to the threshold of the aforementioned current.
  • this switch is characterized in that the movable contact is carried by a lever pivoting about a first articulation axis secured to the control member, the end of this lever opposite to that carrying the movable contact comprising a second articulation axis which is connected to the mechanical threshold device, this second articulation axis being able to move between a normal position which is maintained by the threshold device and in which the movable contact is in abutment against the fixed contact under the action of a spring, and a trigger position relative to the threshold device in which the contacts are separated, in that the magnetic piece occupies with respect to the pivoting lever a position such that it exerts on the latter a torque as a function of the intensity passing through the contacts which reinforces the contact pressure before tripping of the device with mechanical threshold and which makes the lever pivot around its first articulation axis ion integral with the control member, after triggering of the threshold device.
  • This switch operates as follows: as long as the intensity passing through the switch does not reach the desired cut-off threshold, the second articulation axis of the pivoting lever is kept stationary by the threshold device.
  • the magnetic part exerts on the lever a force electromagnetic which tends to reinforce the pressure of contacts and thus to avoid any risk of welding of these.
  • the force exerted by the magnetic piece on the lever exceeds the reaction force of the threshold device, so that the second axis of articulation of the lever disengages from the threshold device and thus the lever pivots by rotation around its first articulation, which causes the opening of the contacts.
  • a rapid opening of the contacts is thus obtained at a current threshold determined with precision and without risk of soldering of the contacts, using remarkably simple means.
  • the axis of articulation of the lever which is integral with the control member is mounted with a certain axial clearance relative to the lever or to this control member so that this lever can pivot at a small angle towards the magnetic part by rotation around the contact support point after the triggering of the threshold device. Thanks to this play, the lever has a certain degree of freedom relative to its first axis of articulation and thus the force exerted by the magnetic piece on the lever causes a reinforcement of the pressure of the contacts, before triggering of the threshold device.
  • the mechanical threshold device comprises a spring bearing against said second axis of articulation of the lever, said spring forming with the longitudinal direction of the lever an obtuse angle open towards the magnetic part when the contacts are closed and this spring forming an obtuse angle open in a direction opposite to the magnetic part when the contacts are open.
  • the mechanical threshold device comprises two balls arranged side by side and projecting laterally from a holding cage fixed to the lever, these two balls being normally engaged respectively in openings made in two articulated blades to a fixed support and extending on either side of the lever, these blades bearing on the balls through the openings on the effect of a spring.
  • the switch according to the invention comprises an outer box 1, made of electrically insulating material, containing three juxtaposed switches, each comprising a fixed contact 2 and a movable contact 3 carried by a pivoting lever 4.
  • This lever 4 and the fixed contact 2 are connected respectively to terminals 5 and 6 by conductors 5a, 6a.
  • an arc blowing chamber 11 Inside the housing 1 and facing the contacts 2 and 3, is disposed an arc blowing chamber 11, of conventional conformation.
  • an electromagnet 6 the movable armature 7 of which is connected to the pivoting lever 4, by means of a coupling piece 8 and of a movable contact carrier 9, both integral with the latter.
  • This contact carrier 9 carries a hinge pin 10, on which the contact lever 4 is mounted.
  • the electromagnet 6 controls the movement of the contact lever 4, between a position for closing the contacts 2, 3 as shown in FIG. 1 and a position for opening these contacts (see FIG. 2). .
  • the invention also provides means for controlling the opening of the contacts 2, 3, independently of the action of the electromagnet 6, when the intensity of the current passing through the contacts exceeds a predetermined threshold, equal for example to thirty or forty times the nominal current and means to reinforce the contact pressure below this threshold.
  • the contact carrier 9 has on its face directed towards the contact lever 4, between the hinge pin 10 and the end 4a of this lever opposite the contact 3, a magnetic piece 12 of cross section in U (see also Figures 5 and 6).
  • the contact lever 4 is engaged in the housing 13 defined by the U-shaped section of the magnetic piece 12.
  • the contact lever 4 has a slot 14 determining a certain radial clearance e with the articulation axis which passes through it.
  • this clearance occurs in the direction D of opening of the contacts relative to the articulation 10.
  • the end 4a of the contact lever 4 opposite the contacts 2, 3 carries an axis 15 to which a connecting rod 16 is articulated, itself articulated by an oblong opening 16a at its end opposite the lever 4 on a fixed axis 17 and therefore with a headset R.
  • a spring 18 which exerts an elastic force against the end 4a of the lever 4.
  • the axis 15 of the link 16 is housed in a groove 15a which guides the movement of this axis between a normal position as shown in Figure 1 and a triggered position shown in Figure 4.
  • the direction R of the spring 18 forms with the direction L of the lever 4, an obtuse angle open in the direction D of opening of the contacts 2. 3, this obtuse angle being smaller when the electromagnet 6 is in the inactive position than when the latter is still in the active position (see FIG. 2).
  • the lever 4 is biased by a second spring 19 against a stop 20 forming part of the contact carrier 9 and opposite to the electromagnet 6.
  • This spring 19 exerts on the lever 4 a force substantially perpendicular to the longitudinal direction L of the lever 4 to apply the movable contact to the fixed contact with a suitable pressure when the electromagnet is active.
  • the spring 18, the articulation 17, 16a, the groove 15a and the axis 15 constitute a mechanical threshold device which is triggered by ensuring the opening of the contacts 2, 3 when the magnetic part 12 exerts on the lever 4. under the effect of the magnetic field created during the passage of a current of predetermined value in the switch, a force which exceeds those which maintain this lever in the closed position as is explained more in detail below.
  • the magnetic attraction force exerted between the lever 4 and the magnetic piece 12 is sufficient to trigger the threshold device constituted by the spring 18.
  • the lever 4 then begins to pivot by rotation around the point of contact between the contacts 2 and 3, at a small angle until the clearance e defined by the light 14 is eliminated.
  • the contact carrier 9 is driven by return springs of the armature 7 to the right of the figure so that the axis 10 and the fulcrum 13a of the part 12 communicate first to the lever 4 a translational movement to the right which drives the axis 15 towards the right bottom of the groove 15a; when a neutral position is exceeded, for which the directions R and L are aligned, the action of the spring 18 on the axis 15 communicates to the lever 4 a slight clockwise rotation around the pivot 10 at the end of which this axis 15 abuts on the right bottom of the groove 15a, so that the different parts return to the respective positions illustrated in FIG. 2.
  • the opening time of the contacts 2, 3 is extremely short, and is much shorter than the response time of the electromagnet 6.
  • the hinge pin 15 connected to the threshold device constituted by the spring 18 can move between a normal rest position which is maintained against the right bottom of the groove 15a by the action of the spring 18 (see Figure 1) and a trigger position in which the hinge pin 15 is held towards the left bottom of this groove (see Figure 4).
  • the movement between these two positions is controlled by the magnetic part 12 which exerts on the lever 4 a torque depending on the intensity passing through the contacts 2. 3.
  • This torque increases the contact pressure before triggering of the threshold device (spring 18) that is to say as long as this torque does not reach the value required to trigger the threshold device.
  • the switch according to the invention has a breaking capacity which can reach 100 effective KA with an absolute guarantee of non-soldering of the contacts for intensities between 160 and 800 A approximately.
  • the controlled opening switch comprises as in the case of the previous embodiment. an insulating housing 21 containing a fixed contact 22 and a movable contact 23 carried by a pivoting lever 24. articulated on an axis 25. This axis 25 is fixed to the end of a contact carrier 26, made integral with the frame 28 of the electromagnet 29 by means of a coupling piece 30.
  • the contact carrier 26 also carries a magnetic piece in U31 in the housing of which is engaged the part of the lever 24 located behind the hinge pin 25 relative to the movable contact 23 (see also Figure 8).
  • an arc blowing chamber 32 is located opposite the contacts 22. 23.
  • the end 24a of the lever 24 opposite the contact 23 carries a mechanical threshold device 37.
  • This device comprises (see FIG. 9) two balls 39 projecting laterally outside a cage 40 carried by the end 24a of the lever 24.
  • These two blades 42 are articulated to two fixed supports 38.
  • the two articulation axes 43 of the blades 42 to the fixed supports 38 extend substantially parallel to the direction of the lever 24, in the position shown in FIG. 7.
  • a spring 44 whose action is such that the openings 41 of the plates 42 bear elastically on the balls 39.
  • this snap-in constitutes at the same time a hinge pin which allows the lever 24 to pivot relative to the fixed supports 38.
  • a fixed stop 46 whose function will be described later.
  • the balls 39 escape from the openings 41 by spreading the blades 42 outwards as indicated in FIG. 12, by compressing the spring 44.
  • the lever 24 first begins to pivot slightly towards the magnetic piece 31 by rotation around the contact point of the contacts 22, 23 (see FIG. 15) until the clearance defined by the light 36 is eliminated.
  • the lever 24 then continues to pivot towards the magnetic piece 31 by rotation around its axis 25 and takes the position indicated in dashed lines in FIG. 7 or represented in the diagram in FIG. 16.
  • the armature 28 of the electromagnet 29 then moves the lever 24 to position b shown in phantom in Figure 7 (see also Figure 17).
  • this lever pivots forward around its articulation axis 25.
  • the balls 39 carried by the rear end 24a of the lever 24 move between the blades 42 towards the spring of recall 44 and snap back into the openings 41.
  • the threshold device 37 is thus rearmed again.
  • the articulation axis defined by the balls 39 forming part of the threshold device 37 can move between a normal rest position which is maintained by the locking force of the balls 39 obtained by the spring 44 in which the movable contact 23 is in abutment against the fixed contact 22 and a tripping position in which the contacts are separated.
  • the movement between these two positions is controlled by the combined action of the magnetic parts 31 and 45 which exert on the lever 24 a torque depending on the intensity passing through the contacts 22, 23.
  • This torque increases the contact pressure before the device is triggered at threshold 37, that is to say as long as this torque does not reach the value required to trigger the threshold device.
  • the switch shown in Figure 7 has compared to that of Figures 1 to 6 among others the advantage of having a safer operation and requiring less mounting precision of its various components.
  • the contactor represented in FIG. 7. has a breaking capacity which can reach 100 KVA, with a guarantee of non-welding of the contacts for intensities between 160 and 800 A about.
  • the single contact lever 4 or 24 can be replaced by double levers which can be moved towards one another.
  • each lever a U-shaped magnetic part and return and / or locking means identical to those of the embodiments shown in FIGS. 1 to 4 and 7.
  • these return and / or locking means may be different from those described, the main thing being that they exert on the lever (s), a force which maintains the contacts in the closed position, as long as the force of attraction exerted by the magnetic part 12 or 31 does not reach the desired value to obtain the opening of the contacts. It is also essential that these means allow acceleration of the opening of the contacts from the beginning of this opening, in order to avoid any risk of contact reclosing on currents of high intensity.
  • These means associated with a magnetic piece allow a combination of antagonistic movements not obvious and obtained with a remarkable economy of means.
  • control member 1 constituted by the electromagnet 6, 29 can be replaced by a mechanical arming device which causes the closing of the contacts by manual way, and which can be opened either by manual way for perform normal opening, either by an internal or external triggering means to confirm automatic opening.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)
  • Mechanisms For Operating Contacts (AREA)
EP84900390A 1983-01-05 1984-01-04 Interrupteur a fermeture et ouverture commandees et a ouverture automatique en cas de surcharge de courant Expired EP0130208B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8300086A FR2538947A1 (fr) 1983-01-05 1983-01-05 Interrupteur a fermeture et ouverture commandees et a ouverture automatique en cas de surcharge de courant
FR8300086 1983-01-05

Publications (2)

Publication Number Publication Date
EP0130208A1 EP0130208A1 (fr) 1985-01-09
EP0130208B1 true EP0130208B1 (fr) 1986-08-20

Family

ID=9284684

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84900390A Expired EP0130208B1 (fr) 1983-01-05 1984-01-04 Interrupteur a fermeture et ouverture commandees et a ouverture automatique en cas de surcharge de courant

Country Status (7)

Country Link
US (1) US4571565A (sl)
EP (1) EP0130208B1 (sl)
JP (1) JPS60500313A (sl)
DE (2) DE3460480D1 (sl)
FR (1) FR2538947A1 (sl)
IT (1) IT1178054B (sl)
WO (1) WO1984002802A1 (sl)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4656444A (en) * 1985-08-16 1987-04-07 Westinghouse Electric Corp. Circuit breaker with force generating shunt
JPH01125923A (ja) * 1987-11-11 1989-05-18 Sumitomo Chem Co Ltd 気相成長装置
US4951021A (en) * 1988-10-28 1990-08-21 Eaton Corporation Electromagnetic switching apparatus having dynamically balanced latch trip
JP2826772B2 (ja) * 1991-01-07 1998-11-18 キヤノン株式会社 液晶表示装置
DE4333278A1 (de) * 1993-09-24 1995-03-30 Siemens Ag Leistungsschalter mit einer Lichtbogenlöscheinrichtung
US5847629A (en) * 1997-04-03 1998-12-08 Eaton Corporation Circuit breaker contact spring subassembly and method and apparatus for making and circuit breaker incorporating same

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2944129A (en) * 1957-11-12 1960-07-05 Fed Pacific Electric Co Circuit breakers
DE1169014B (de) * 1961-12-21 1964-04-30 Licentia Gmbh Strombegrenzender Niederspannungs-Leistungsselbstschalter
NL158644B (nl) * 1969-03-25 1978-11-15 Hazemeijer Bv Elektrische schakelaar met elektrodynamische vergroting van de contactdruk en van de uitschakelsnelheid.
JPS5422109B2 (sl) * 1973-07-19 1979-08-04
IT1038809B (it) * 1974-06-21 1979-11-30 Siemens Ag Apparecchio elettrico di manovra
DE2552176A1 (de) * 1975-11-21 1977-06-02 Hoechst Ag Neue piperidin-derivate, ihre herstellung und verwendung
JPS5350847A (en) * 1976-10-20 1978-05-09 Fujitsu Ltd Optical branching circuit
FR2483683A1 (fr) * 1980-05-30 1981-12-04 Telemecanique Electrique Contacteur ayant des proprietes de disjoncteur
JPS58131636A (ja) * 1982-01-29 1983-08-05 松下電工株式会社 リモ−トコントロ−ル式回路しや断器

Also Published As

Publication number Publication date
IT8447507A0 (it) 1984-01-04
IT1178054B (it) 1987-09-09
DE130208T1 (de) 1985-05-09
FR2538947A1 (fr) 1984-07-06
DE3460480D1 (en) 1986-09-25
US4571565A (en) 1986-02-18
FR2538947B1 (sl) 1985-04-19
JPS60500313A (ja) 1985-03-07
WO1984002802A1 (fr) 1984-07-19
EP0130208A1 (fr) 1985-01-09
JPH0253903B2 (sl) 1990-11-20

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